Spits branch and status nodes into separate files

Removes status node for now

src/views/branchHistoryNode.ts

@@ -0,0 +1,29 @@
+'use strict';
+import { Iterables } from '../system';
+import { ExtensionContext, TreeItem, TreeItemCollapsibleState } from 'vscode';
+import { CommitNode } from './commitNode';
+import { GlyphChars } from '../constants';
+import { ExplorerNode, ResourceType } from './explorerNode';
+import { GitBranch, GitService, GitUri } from '../gitService';
+
+export class BranchHistoryNode extends ExplorerNode {
+
+        readonly resourceType: ResourceType = 'branch-history';
+
+        constructor(public branch: GitBranch, uri: GitUri, context: ExtensionContext, git: GitService) {
+            super(uri, context, git);
+         }
+
+        async getChildren(): Promise<CommitNode[]> {
+            const log = await this.git.getLogForRepo(this.uri.repoPath!, this.branch.name);
+            if (log === undefined) return [];
+
+            return [...Iterables.map(log.commits.values(), c => new CommitNode(c, this.uri, this.context, this.git))];
+        }
+
+        getTreeItem(): TreeItem {
+            const item = new TreeItem(`${this.branch.name}${this.branch.current ? ` ${GlyphChars.Dash} current` : ''}`, TreeItemCollapsibleState.Collapsed);
+            item.contextValue = this.resourceType;
+            return item;
+        }
+    }